The wire through pipe is generally introduced by steel wire. When the pipe is long or there are many elbows, one end should be wired and the other end should be sent, and the two people should coordinate the movement. The wires inserted into the hall should be parallel, not to each other. Winding.
In order to make the line worn inside the conduit work safely and reliably, all the wires of the same circuit must be worn in the same pipe, and the circuits with different voltages are not allowed to be laid in the same pipe, and the wires in the pipe are not allowed to have joints.
When specifically wiring the conduit, pay attention to the following items:
1. The insulation strength of the pipe-through conductor shall not be lower than 500V, and the minimum section of the conductor shall be 1mm2 for the copper core wire and 2.5mm2 for the aluminum core wire;
2. The wire inside the wire tube is not allowed to have a joint, nor is it allowed to penetrate the wire after the insulation is broken and then the insulation is repaired by dressing;
3. The number of conductors in the pipeline shall not exceed 10, and the conductors of different voltages or different watt-hour meters shall not be worn in the same conduit, but one motor includes all the conductors of the control and signal loops, and the lines of multiple motors of the same equipment. , allowed to wear in the same line pipe.
4. Except for DC link wires and grounding wires, do not wear a single wire in the steel pipe;
5. When the line pipe is turned, the method of bending the line tube should be adopted. It is not advisable to use the moon bend of the finished product to avoid excessive connection of the nozzle;
6. The line pipe line should be as small as possible to bend or bend, because the more corners, the more difficult it is to thread. In order to facilitate threading, it is stipulated that when the conduit exceeds these lengths, a junction box must be added. When there is no bending angle, it shall not exceed 45m; when there is one bending corner, it shall not exceed 30m; when there are two bending angles, it shall not exceed 20m; when there are three bending angles, it shall not exceed 12m.
7. In the wire pipe laid in the dark line of concrete, the wire tube with a wall thickness of 3mm must be used. When the outer diameter of the wire pipe exceeds 1/3 of the thickness of the concrete, the wire pipe is not allowed to be buried in the concrete, so as not to affect the concrete. strength.
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